X100 F4.0 sharper than F8.0?
If you would check out a bunch of lens tests—here or on Photozone.de—you will see that the sweet spot for most lenses in the f/1.8-2.0 range tends to be around f/4.0-5.6 and down just a tad by f/8.0. Your mileage may vary a bit from lens to lens.
|.....the ROYAL LOTUS 2017/08/25-NEW YORK..... by Chiwat|
from Wild flowers
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from Another cup of coffee